Electron hole as an Antenna radiating plasma waves

Details Electron hole as an Antenna radiating plasma waves Electron hole as an Antenna radiating plasma waves

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1371s&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 7, p. 1371-1374

Physics

11

Ionosphere: Auroral Ionosphere, Ionosphere: Wave Propagation, Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Plasma Waves And Instabilities

Scientific paper

Recent observations of electron holes (e-holes) in space plasma have led to theoretical and numerical studies which show that e-holes in a magnetized plasma are unstable nonlinear structures. Their decay generates plasma waves in the frequency bands of l_ower h_ybrid (LH) and e_lectrostatic w_histler (EW) waves. An analysis is presented demonstrating that the e-holes are an effective radiator of plasma waves in the above frequency bands critically depending on their scalelength (⊥) transverse to the ambient magnetic field. In this sense, an e-hole acts like a radiating antenna. The results from 3-D numerical simulations are presented to examine the nonlinear consequences of the radiation from e-holes. When e-holes have long ⊥ during the initial stage of their existence, they undergo a beading process. This involves radiation of spatial Fourier components corresponding to long scalelength in the structure of e-holes, leaving behind smaller structures. This divides the initially large e-hole structure into several fragments. The resulting smaller structures with ⊥~∥ eventually dissipate by radiating transversely structured lower hybrid waves.

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